664 THAXTER. 



broader below its junction with the tip, which is thus clearly dis- 

 tinguished by rounded elevations on either side; the tip paler, but 

 becoming slightly granular at full maturity, abruptly and consider- 

 ably narrower, short, stout, its margins more or less distinctly convex: 

 the apex much shorter, abruptly narrower, hyaline, the lips nearly 

 equal, rather prominent, the outer slightly longer. Spores 36 X 

 4ju. Peri thecia 124 /z; venter 42-51 X 42-44 ^; neck 50-54 ^i; tip 

 and apex 22-25 /x. Appendage 34 X 10 fx. Receptacle 110-170 X 

 22 ^t. Total length to tip of perithecium 245-315 /x. 



At the base of the posterior legs of an undetermined fly belonging 

 to the Borboridae. No. 2037, Near Cartago, Costa Rica (Calvert). 



This species recalls S. indentatus in the form and position of the 

 stalk-cell of its appendage, while the latter is unlike that of most 

 species known to me; the third cell being completely transformed to an 

 antheridium. It is difficult to determine in the three specimens 

 examined whether the basal cell of the appendage always bears two 

 antheridia, owing to the position of the individuals. The form of 

 the perithecium, although the venter is relatively shorter, recalls that 

 of S. constrictus. I am gi-eatly indebted to Mr. Calvert for com- 

 municating the specimen on which this species occurred. 



On Sapromyzidae . 



Stigmatomyces inflatus nov. sp. 



Form rather long and slender. Basal cell of the receptacle tapering 

 to the pointed base, the upper half hyaline, the lower tinged with 

 brownish yellow and more or less distinctly banded transversely; 

 subbasal cell usually somewhat more than twice as long, hyaline, 

 becoming but slightly broader distally. Stalk-cell of the appendage 

 rather long and narrow, extending to the subbasal cell, but rarely 

 overlapping it slightly, distally hardly prominent: appendage con- 

 sisting of four superposed cells; the basal thick -walled, nearly twice 

 as long as broad, persistent, amber-brown, concolorous with the 

 venter of the perithecium; the subbasal occupying the whole width 

 of the appendage, slightly tinged, its lateral walls persistent, bearing 

 distally and externally two superposed antheridia; the rest of the 

 appendage hyaline, thin-walled, and soon shriveled; the third and 

 fourth cells bearing each two superposed antheridia which occupy the 

 whole outer margin; the series ending in two obliquely superposed 



